How to detect drill mode

Hi Alex, alexpokerface 

Yes, you can detect drill mode in custom visuals.

How it works:

When a user clicks "Drill Down" in Power BI, the visual gets a new update call. In that update, Power BI tells your visual what mode it's currently in through the DataView metadata.

The Code:

Put this inside your `update(options: VisualUpdateOptions)` method:

```typescript
import { DrillState } from "powerbi-visuals-api";

public update(options: VisualUpdateOptions) {
const dataView = options.dataViews?.[0];

if (!dataView) return;

const drillState = dataView.metadata?.drillState;

switch(drillState) {
case DrillState.DrillDown:
// User clicked Drill Down on a category
// Example: Year -> Quarter -> Month
this.renderDrillView(dataView);
break;

case DrillState.Expand:
// User clicked + icon to expand tree
this.renderExpandedView(dataView);
break;

case DrillState.None:
default:
// Normal selection mode

I hope you got the answer is any problem you can freely to ask here , Thanks 😊